Antenna



July 1, 1952 D. CANADY ANTENNA Filed Nov. 6,- 1948 INVENTOR. om CANADY.

Arrow/V52 vtion to the grid l of a vacuum tube Patented July 1, 1952 UNITED STATES PATENT OFFlCE ANTENNA Don Canady, Cincinnati, Ohio Application November 6,

' 2 Claims. (01250-3357) This invention relates to improvements in antennae, particularly to the means for increasin the signal strength. In tuned antennae if more turns are added to a single antenna the wave length will be changed, likewise there is a limitation to the size of the loops for practical use. However, I have found that by using several loops mounted on the same axis and in spaced relation, to prevent induction from one loop to the other, and coupling the loops in series with movable plate condensers across the series of loops, I can tune the antennae to the desired frequency with an added signal strength imparted to the grid of the vacuum tube.

The object of my invention is to increase the signal strength of the received waves.

My invention will be further readily understood from the following description and claims, and from the drawings, in which latter:

Fig. 1 is a circuit diagram, showing a pair of antennae coupled to a vacuum tube.

Fig. 2 is front view of the antenna mounting;

Fig. 3 is a side view of the antenna mounting.

While two antennae are shown in Fig. 1, it is.

be used or other be employed with obvious that any number may types than loop antennae may the same circuit.

Referring to Fig. 1, the antenna loops II and 12 are connected in series having movable plate condensers l3 and I4 across the series connec- 16 of the first stage of the receiver amplifier. The antennae are mounted so that each antenna will be parallel to the wave on the same axis to receive the wave instantaneous and due to the series coupling the waves picked up become addable thereby increasing the signal strength. The condensers l3 and 14 are controlled by one tuning control mounted on a single shaft for maintaining the same frequency.

In Figs. 2 and 3, I have shown a plurality of antennae I! mounted on the same axis and being supported on posts 18 secured to a crossbar I9 which is rotatable on a stand 20. In this manner the antenna can be rotated to present all of the antennae to the directional wave,

whereby each antenna picks up the wave simulrespective antenna 1948, Serial No. 58,655

taneously and the signal strength is increased in an addable manner depending on the number of antennae coupled together. The vacuum tube being a voltage operated device the added voltage from the several antennae causes an increase in signal strength. It is important that the antennae be positioned on the same axis so that there will be no lag or phase shift in the signal entering the combined antennae.

Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. Antenna means for increasing the signal strength to the grid of a receiving circuit comprising a plurality of antennae mounted on the same axis and connected in series, and movable plate condensers interlocked for tuning the respective antenna to the same frequency to increase the voltage applied to the grid of the receiving circuit.

2. Antenna means for increasing the signal strength to the grid of a receivingcircuit comprising a plurality of antennae mounted on the same axis and movable as a unit, said antennae being connected in series with movable plate condensers interlocked in the circuit for tuning the to the same frequency to increase the voltage applied to the grid of the receiving circuit.

DON CANADY.

REFERENCES CITEDv The following references are of record in the file of this patent; 

